Holographic heavy-light chiral effective action

Yizhuang Liu and Ismail Zahed
Phys. Rev. D 95, 056022 – Published 27 March 2017

Abstract

We propose a variant of the D4D8 construction to describe the low-energy effective theory of heavy-light mesons, interacting with the lowest lying pseudoscalar and vector mesons. The heavy degrees of freedom are identified with the D8LD8H string low-energy modes, and are approximated near the world volume of Nf1 light D8L branes, by fundamental vector field valued in U(Nf1). The effective action follows from the reduction of the bulk Dirac-Born-Infeld and Chern-Simons actions, and is shown to exhibit both chiral and heavy-quark symmetry. The action interpolates continuously between the U(Nf) case with massless mesons, and the U(Nf1) case with heavy-light mesons. The heavy-light meson radial spectrum is Regge-like. The one-pion and two-pion couplings to the heavy-light multiplets are evaluated. The partial widths for the charged decays GH+π are shown to be comparable to the recently reported full widths for both the charm and bottom mesons.

  • Figure
  • Received 15 December 2016

DOI:https://doi.org/10.1103/PhysRevD.95.056022

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Yizhuang Liu* and Ismail Zahed

  • Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA

  • *yizhuang.liu@stonybrook.edu
  • ismail.zahed@stonybrook.edu

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Issue

Vol. 95, Iss. 5 — 1 March 2017

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